Indirection should work for tstart

[ksbhaskar]

Final Release Note

Summary of Issue

Indirection for tstart gives a VAREXPECTED error. For example, the code:

tpindir
	tstart (a)
	tcommit
	write "Non-indirection works.",!
	set x="a"
	tstart @x
	tcommit
	write "The workaround for a single variable works.",!
	set x="(a)"
	tstart @x
	tcommit
	write "Indirection works.",! ; OK, it does not, but should
	quit

produces the following result:

$ mumps -run tpindir
Non-indirection works.
The workaround for a single variable works.
Error occurred: 150373866,tpindir+9^tpindir,%GTM-E-VAREXPECTED, Variable expected in this context
$ 

This is a defect in the upstream GT.M code base, identified by GTM-8359.

Draft Release Note

Indirection of TSTART arguments works as documented. Previously, it gave a VAREXPECTED error. A workaround when the argument is a single variable was to omit the parentheses.

[nars1]

It is not trivial to get TSTART @x to work where X is a comma-separated list of M variable names. Since a workaround is to wrap the TSTART command, the body of the transaction and the TCOMMIT in an M statement and use "XECUTE" on it, and that should have the overhead of compiling only once, it is reasonable performance-wise too. So labeling this as "wontfix".